Definition
A weather observation site operated under contract to the National Weather Service, where trained personnel take and report surface weather observations used in aviation forecasts and reports.
Plain English
A weather station run by people on contract with the National Weather Service. They watch the sky and instruments at that location and send in regular weather reports.
Context Anchor
You may see WSCMO in FAA acronym lists, airport weather-source descriptions, or references to official aviation weather observations.
Derivation
‘Contract’ signals that the observers are not direct government employees but work under a contract arrangement. ‘Meteorological observatory’ simply means a place where weather is observed and recorded.
Why Pilots Care
Knowing a report comes from a staffed observatory (rather than a fully automated sensor) tells you a human was involved in the observation, which can include things automated systems sometimes miss, like distant weather, cloud type, or unusual phenomena.
Example Sentence 1
The surface observation for that field came from a WSCMO, so the cloud and visibility report reflected what a human observer actually saw.
Example Sentence 2
A pilot checked the latest data originating from the WSCMO before departure.